## setup ##

# clean environment
rm(list=ls())

# load packages
library(sandwich)
library(lmtest)

# load data
dat <- read.csv2("data_experiment_w_pilot_csv.csv",
                encoding = 'UTF-8')

# outcome variable to numeric
dat$response <- as.numeric(as.character(dat$response))


## models ##

# column 1
mod_1 <- lm(response~immback+partisan, data=dat)

# column 2
mod_2 <- lm(response~immback*partisan, data=dat)


## robust standard errors

# column 1
mod_1_rob <- coeftest(mod_1, vcov = vcovHC(mod_1, "HC1"))

# column 2
mod_2_rob <- coeftest(mod_2, vcov = vcovHC(mod_2, "HC1"))


## show coefficients and SEs
mod_1_rob
mod_2_rob
